When UAC (User Account Control) screen shows on the server, viewer crashes (or terminates without any message) immediately and it is not possible to connect again to the server until the UAC screen is handled locally on the server.

Both client and server are 1.0.9.1 on Windows 7 64 bit.
The server uses the hook driver.

Thank you for the explication! I run WinVNC as an application (with escalated privileges) to enable the driver. Then I was wondering why I cannot access UAC screens having suspicion that they used to be accessible.

Should not rather WinVNC send a message to the client saying that it cannot access the screen so the client could show the reason for closing the connection? The current behaviour is very user unfriendly.